general problems of the 2021 Toyota Highlander - part 2

The contact owns a 2021 Toyota Highlander. The contact stated that the vehicle experienced transmission failure while driving. There was an abnormal whining sound coming from the vehicle while accelerating, and the sound increased in volume while driving. There was no warning light illuminated. The vehicle was taken to the local dealer, where it was diagnosed with an internal transmission failure. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 55,803.

The contact owns a 2021 Toyota Highlander. The contact stated that while driving at an undisclosed speed, there was an abnormal whining sound coming from the transmission. The contact was concerned about the sound and contacted a dealer. The vehicle was driven to the dealer and was diagnosed with transmission failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 60,347.

I am reaching out regarding our 2021 Toyota Highlander which currently has $65 k miles and is just out of warranty. Recently we noticed a wining noise during acceleration. We took the vehicle to the dealer who told us that the transmission will need to be replaced. $9500 repair. This is a known issue with Toyota and they will not work with us on this. We are stuck! no customer goodwill! thank you!.

I purchased my brand new Highlander on January 31, 2021 and was told today that I need a transmission replacement. My vehicle started about two month ago with a whining sound while accelerating. My vehicle currently has 78,000 miles and is out of the extended warranty of 60,000/5 year. I learned that Toyota released a bulletin on February 9, 2021 stating transmission issues for particular Toyota models, the Highlander being one. After researching the issue, there are several stories of Highlander owners who are experiencing the same issue. It’s a shame that they knew of the problem in February 2021 and with the transmission replacements on vehicles less than 5 years old and haven’t issued a formal recall for this known defect.

The vehicle experienced a transmission failure at approximately 62,000 miles, which required a transmission replacement. Toyota replaced the transmission with a rebuilt transmission. Immediately after the repair, the vehicle began experiencing multiple issues that were not present prior to the repair. The vehicle initially would not reverse, and the battery was drained shortly after the repair was completed. Following the repair, the vehicle has continued to experience ongoing electrical malfunctions, including dashboard warning lights, system alerts, and dash lights flashing during remote start. The vehicle has also developed a rattling noise underneath the vehicle. The exact failed component has not been clearly identified. The dealership has provided changing diagnoses and has not provided written diagnostic documentation despite requests. The vehicle has been inspected by the dealership multiple times; however, the issues have not been resolved. During a recent diagnostic, the dealership stated that the catalytic converter is now the issue, but this does not address the ongoing electrical problems. These issues raise safety concerns due to unpredictable vehicle behavior and potential failure of critical systems while driving. Warning lights and system errors began appearing after the transmission repair and have continued since that time. The vehicle is available for inspection upon request.

Toyota is asking me to pay for a brand new transmission replacement in my car that is only 5 years old, 74,000 miles on it. The cost is $10,000. How is it possible a brand new vehicle is needing this? I have read a lot of reviews that Toyota is knowingly using the transmission type that they even had to recall on earlier models. Why are they still making vehicles using this type of transmission when it continues to need total transmission replacement so early on? and offer zero assistance. We bought Toyota because we thought it was the best. I will never buy Toyota again, this is a huge cost for a young family with a teachers salary.

Transmission has started to whine, my understanding is this is common for the transmission I have. I have had this verified by 2 different garages. There are no engine lights showing. The noise started around 90k.

I had the 60,000 mile service on February 2,2026 and after the service was completed I left the dealership and got on the freeway to go home. I heard a whining noise and immediately turned around and took it back to the dealer. I took the mechanic who worked on my car for a drive and he was able to hear the winding noise and we returned to the dealership. It took the mechanic three hours to come to the conclusion that I needed a new transmission. They still have my car and I have not heard anything about coverage or when it will be done.

The contact owns a 2021 Toyota Highlander. The contact stated that there was an abnormal winding sound coming from the vehicle while accelerating. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed with transmission failure. The vehicle was not repaired. The contact called a transmission shop and was informed that the part to repair the vehicle was on back order. The manufacturer was contacted, opened a case, and referred to the NHTSA hotline to report the failure. The failure mileage was approximately 106,000.

Known transmission failure. Whining noise when accelerating. T-sb-0008-21.

The transmission in my 2021 Toyota Highlander began making a loud whining/whirring noise that increases with vehicle speed. The vehicle was inspected by a Toyota dealership, and I was told the transmission has failed and needs to be replaced. Toyota stated the repair would be out of pocket, despite the vehicle’s age and proper maintenance. There were no warning lights prior to the failure. This condition affects drivability and raises safety concerns, including the risk of sudden transmission failure or loss of power while driving, especially at highway speeds. I believe this is a premature transmission defect and am reporting it for investigation.

Whinning noise during acceleration on the road and gear shift problems.

- the vehicle has been experiencing shifting issues (its an automatic vehicle) when driving in all instances and at all speeds that has progressively gotten worse over the past 4-8 weeks. - as it seems to be a transmission issue (and a known one pending litigation) the safety issue is if the transmission fails during operation of the car. - it was brought to a dealership to be inspected after it was initially felt as more of a vibration than the more harsh shifting/engine sounds and issues that it is currently experiencing. The dealership thought it to be the front hub assembly/bearing that was the issue. I had the front driver side replaced and the issue still remains and has continued to worsen. It has not been inspected by the manufacturer, police, or insurance representative. - there have been no warning lamps or messages at all. - through research it appears this is a known issue with ongoing litigation (2 class action lawsuits currently in litigation related to ua80f transmissions of which it appears that our VIN is in the affected group).

We began noticing a whining sound that has progressively gotten louder and more frequent upon acceleration. After taking it to the dealership, they claim it requires a transmission replacement. According to the dealership themselves and information online, this seems to be a common defect with 2021 Highlanders.

Technical service bulletin was issued for my 2021 Highlander car in February of 2021 for a well documented transmission issue (whine and grind noise). We are now put in a position that requires us to replace the transmission at a substantial cost. This expense is budget crushing and any assistance in getting Toyota to assist with the expense would be greatly appreciated.

The contact owns a 2021 Toyota Highlander. The contact stated that while driving at an undisclosed speed, the vehicle jerked abnormally and failed to accelerate as intended while depressing the accelerator pedal. The contact pulled to the side of the road. The vehicle failed, then failed to respond while in drive or reverse. No warning light was illuminated. The contact called for roadside assistance and had the vehicle towed to a safe location. The vehicle was then towed to an independent mechanic, who diagnosed the vehicle and informed the contact that the transmission had failed and needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was not notified of the failure. The failure mileage was unknown.

Transmission has failed, making high pitched whining noise while accelerating. Will need full replacement the car only has 66k miles on it - just out of warranty.

Transmission started to make a whining noise. After a month the sound increased in loudness and took to dealer to check. Came back with needing transmission replaced due to bad bearing. Was replaced with aftermarket warrenty protection.

I started hearing a winning noise that got louder with speed, this month I took it to the dealership in austin, TX and they said it needed a new transmission. It only has 67,219 miles. My 2008 was sold at 219k miles with no problems. I see online there has been problems with this type of transmission for many years. They are replacing it with the very same transmission. . . .

I was driving to a stop light when I heard a raddle. Pull over and all the oil came out the engine. When I took it to the dealer they told me that the engine blew up. 14k repair that Toyota would not cover the repair.

The contact owns a 2021 Toyota Highlander. The contact stated that while driving at various speeds and depressing the accelerator pedal, the contact heard an abnormal whining sound coming from the front of the vehicle. The vehicle was taken to an independent mechanic, where the contact was informed that it was a known failure. The vehicle was then taken to the dealer, where it was diagnosed, and determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and advised the contact to work with the dealer to have the transmission repaired. The failure mileage was 66,000.

I bought my 2021 Toyota Highlander on 11/17/2025 and approximately one month later, I heard a whining noise when the car accelerates past 25 mph. The whining noise gets progressively louder the more the car accelerates. In addition, when driving over a bump or hump, there is a grinding/creaking noise that occurs. I took my car into the Toyota dealership on 12/29/2025 and the service technicians were able to replicate my issues. They even stated that the issue is caused by a bearing failure inside the transmission. I also purchased an extended warranty but unfortunately the inspector sent by the warranty company wants me to get a transmission fluid exchange because they think that will solve the issue. The entire transmission needs to be replaced.

The transmission has developed a transmission whining noise which Toyota has released a TSB 0008-21. My vehicle has 104,000 miles and is now out of warranty. If this is a known defect on many Toyota vehicle models a transmission replacement should be free if no longer in warranty.

Whining sound upon acceleration. Occasional hesitation when shifting gears or rough shifting when going from complete stop to accelerating. Dealership says need new transmission. Warranty company test drove and agreed with dealership findings. 60,000 miles .

I brought my 2021 Highlander l in for some regular maintenance and reported that within the last 2 weeks I have been hearing a whining sound when the vehicle is decelerating. I was informed at the end of the day that the transmission is bad and needs to be replaced. My vehicle is just outside of warranty (69k miles). I have always ensured my Highlander got an oil change on time, had all recommended maintenance done at that appropriate time/milage, and brought it in for safety recalls promptly. This vehicle has never been in an accident, and while I have owned it (and according to carfax when I purchased it) I have always brought it to a Toyota dealership for any and all work. There have never been any warning messages, and even though my vehicle has been into Toyota regularly for oil changes and regular maintenance, I was never notified of any other issues. I also use this vehicle at least once a year for road trips (over 200 miles) and before every trip bring it in to have it checked. I'm being told it'll be about $10k to fix. Based on my research I have discovered this is a problem many people with a 2021 Highlander are having, also a class action lawsuit was filed due to transmission issues but only covered Highlanders up to 2020. This seems to be the same issues those vehicles had but I'm being told it's not covered or a recall.

Just after the 60,000 mile warranty, the car started making a whining noise when pushing the accelerator. This is part of the well known transmission problem. Transmission will need to be replaced.

Automatic transmission making humming noise while driving, can potentially fail without warning and leading to loss of power and potential crash.

My 2021 Toyota Highlander is experiencing a transmission issue causing a high pitched whining. It has the problematic ua80f. Toyota has declined to remedy the problem even with it being a known issue.

At around 70,000 mi the transmission started making noises and at the 80,000 mile marker I took it in for its maintenance they found debris in the transmission fluid and I was just told it's either a replace it now or replace it when it falls out of the vehicle. A vehicle with less than 100,000 mi and I am the only owner, for the transmission to go out or start going out and Toyota not solve problems is ridiculous.

Almost caused high speed accident merging onto toll road! the vehicle is experiencing a severe transmission slippage, shudder, and grinding noise, consistent with TSB-0008-21 (ua80 transmission failure). This defect causes hesitant acceleration and erratic shifting, creating a safety hazard when merging onto highways or crossing intersections. I am concerned the transmission will fail completely while driving, resulting in a sudden loss of motive power and increasing the risk of a crash. Toyota has covered this exact safety defect in 2017–2019 models (csp zjc) but has failed to recall the 2021 models despite identical symptoms. First reared it's head as slipping when putting vehicle in reverse, 25k+ ago. Was told by Toyota certified mechanics it was an operator error. Morphed into larger issue.

Transmission is making a loud whine when accelerating. Dealer says the transmission cannot be repaired and must be replaced.

2021 Highlander xle started making a whining noise when accelerating. Noise stops when you let off the gas. Took it to Toyota who said the transmission needed to be replaced. Although everywhere you look this is apparently a known problem, Toyota has yet to cover it or recall the part making the owners have to pay 9k to replace a transmission.

I am writing about my 2021 Toyota Highlander xle awd VIN # [xxx] . I purchased this vehicle brand new on 3/29/2021 at ‘koons easton Toyota’ in easton, MD. In October 2025 I started hearing whining noise from the engine compartment. It was audible only when accelerating the vehicle and would go away if I took my foot off the accelerator. On 10/22/2025, I took the vehicle for inspection to ‘ourisman Toyota 40’ dealership in edgewood, MD. The technician told me that this is a known issue in this model/year and recommended to replace transmission as there was no other fix. He gave me a $9,995 estimate for transmission replacement. I subsequently learned that there was technical service bulletin on this exact defect released by Toyota on 2/9/2021. It said that models with ua80f transmission will make whining noise and then fail. The only remedy was to replace the transmission with brand new transmission part number 30500-0e160. This bulletin was posted on NHTSA website also. [xxx] this bulletin was released 50 days before I purchased the brand-new vehicle on 3/29/2021. My frustration and disappointment came from the fact that Toyota had known about this issue for 50 days and still proceeded to sell this vehicle to me. This is unacceptable as there should have been a recall on this defect or Toyota should have pulled the vehicle from the market. This is not about the powertrain warranty running out as that would apply to unforeseen issues that neither manufacturer nor buyer knew about in advance. It is about knowingly selling the customer a defective product even after disclosing the major defect publicly. Transmission failure can be a serious safety issue because it could have caused sudden loss of power and difficulty controlling speed. I request NHTSA to investigate these widespread Highlander transmission issues the same way Ford f150 transmission issues are being investigated. Thanks information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

There is a known transmission issue with some 2021 Toyota Highlanders, avalons, and camrys. Toyota bulletin t-sb-008-21 from February of 2021 states 'some 2021 model year avalon, Highlander, and camry vehicles equipped with ua80e or ua80f transmissions may exhibit a whine or grind noise from the transmission. This condition may be caused by an issue with the front carrier assembly pinion shafts'. I have a 2021 Highlander with 127,000 miles that started to show this whine noise. Local transmission shop confirms that a new transmission is needed. I am taking it to a local Toyota dealer next week to confirm. I started a case online with Toyota USA, and since I'm over warranty, they started that will not assist with reimbursement. My complaint is how came a recall was not done on this? why did Toyota do nothing and now many of their customers with these vehicles face costly repairs ($7,000 - $12,000)? Toyota should at least reimburse their customers for some of the cost of the repair needed for this, even if out of warranty.

Hearing a whining noise when I step on the gas pedal. The Toyota dealership informed me I need a new transmission on a 4 year old vehicle with about 88,000 miles on it. Toyota said because there is no recall, they will not cover the replacement.